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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ddmuilib.logcat;
import com.android.ddmlib.IDevice;
import com.android.ddmlib.Log.LogLevel;
import com.android.ddmlib.logcat.LogCatListener;
import com.android.ddmlib.logcat.LogCatMessage;
import com.android.ddmlib.logcat.LogCatReceiverTask;
import org.eclipse.jface.preference.IPreferenceStore;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* A class to monitor a device for logcat messages. It stores the received
* log messages in a circular buffer.
*/
public final class LogCatReceiver implements LogCatListener {
private static LogCatMessage DEVICE_DISCONNECTED_MESSAGE =
new LogCatMessage(LogLevel.ERROR, "", "", "",
"", "", "Device disconnected");
private LogCatMessageList mLogMessages;
private IDevice mCurrentDevice;
private LogCatReceiverTask mLogCatReceiverTask;
private Set<ILogCatBufferChangeListener> mLogCatMessageListeners;
private IPreferenceStore mPrefStore;
/**
* Construct a LogCat message receiver for provided device. This will launch a
* logcat command on the device, and monitor the output of that command in
* a separate thread. All logcat messages are then stored in a circular
* buffer, which can be retrieved using {@link LogCatReceiver#getMessages()}.
* @param device device to monitor for logcat messages
* @param prefStore
*/
public LogCatReceiver(IDevice device, IPreferenceStore prefStore) {
mCurrentDevice = device;
mPrefStore = prefStore;
mLogCatMessageListeners = new HashSet<ILogCatBufferChangeListener>();
mLogMessages = new LogCatMessageList(getFifoSize());
startReceiverThread();
}
/**
* Stop receiving messages from currently active device.
*/
public void stop() {
if (mLogCatReceiverTask != null) {
/* stop the current logcat command */
mLogCatReceiverTask.removeLogCatListener(this);
mLogCatReceiverTask.stop();
mLogCatReceiverTask = null;
// add a message to the log indicating that the device has been disconnected.
log(Collections.singletonList(DEVICE_DISCONNECTED_MESSAGE));
}
mCurrentDevice = null;
}
private int getFifoSize() {
int n = mPrefStore.getInt(LogCatMessageList.MAX_MESSAGES_PREFKEY);
return n == 0 ? LogCatMessageList.MAX_MESSAGES_DEFAULT : n;
}
private void startReceiverThread() {
if (mCurrentDevice == null) {
return;
}
mLogCatReceiverTask = new LogCatReceiverTask(mCurrentDevice);
mLogCatReceiverTask.addLogCatListener(this);
Thread t = new Thread(mLogCatReceiverTask);
t.setName("LogCat output receiver for " + mCurrentDevice.getSerialNumber());
t.start();
}
@Override
public void log(List<LogCatMessage> newMessages) {
List<LogCatMessage> deletedMessages;
synchronized (mLogMessages) {
deletedMessages = mLogMessages.ensureSpace(newMessages.size());
mLogMessages.appendMessages(newMessages);
}
sendLogChangedEvent(newMessages, deletedMessages);
}
/**
* Get the list of logcat messages received from currently active device.
* @return list of messages if currently listening, null otherwise
*/
public LogCatMessageList getMessages() {
return mLogMessages;
}
/**
* Clear the list of messages received from the currently active device.
*/
public void clearMessages() {
mLogMessages.clear();
}
/**
* Add to list of message event listeners.
* @param l listener to notified when messages are received from the device
*/
public void addMessageReceivedEventListener(ILogCatBufferChangeListener l) {
mLogCatMessageListeners.add(l);
}
public void removeMessageReceivedEventListener(ILogCatBufferChangeListener l) {
mLogCatMessageListeners.remove(l);
}
private void sendLogChangedEvent(List<LogCatMessage> addedMessages,
List<LogCatMessage> deletedMessages) {
for (ILogCatBufferChangeListener l : mLogCatMessageListeners) {
l.bufferChanged(addedMessages, deletedMessages);
}
}
/**
* Resize the internal FIFO.
* @param size new size
*/
public void resizeFifo(int size) {
mLogMessages.resize(size);
}
}
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